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Riggs, E.S. 1935. A skeleton of Astrapotherium. Field Museum of Natural History, Geological Series 6(13):167-177. 1935. A skeleton of Astrapotherium. Field Museum of Natural History, Geological Series 6(13):167-177.
Riggs, E.S. 1935. A skeleton of Astrapotherium. Field Museum of Natural History, Geological Series 6(13):167-177. 1935. A skeleton of Astrapotherium. Field Museum of Natural History, Geological Series 6(13):167-177.